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Recursive Testing.  If one PAGS group (the child group) belongs to another PAGS group (the parent group), then an IPerson member of the child group must also pass the test(s) required for membership in the parent group.  This is a more restrictive contract than the group system in general requires, where membership in a group only means that some relationship exists between a group and its members.  Here, when an entity group member belongs to a group, it means that the underlying entity has some specific attribute value(s).  The PAGS enforces this by testing the entity for membership in all its parent groups, which means you can nest the testing of entity members.  For example, assume a group named named "employees" requires status equal to "employed" and a group named "seniors" requires age GE 65.  If "seniors" is a member of "employees", then any IPerson member of "seniors" is required to have both age GE 65 and status equal to "employed".